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We can build new power plants, and you're talking about the types of water usage that are going to be cut last. Agriculture actually takes up the vast majority of water usage, and there are lots of types of farming that use more water than others. This is also ignoring the fact that in many areas there will be increased precipitation and a larger number of growing days per year, meaning more potential food can be grown. Climate change will cause major problems, but I just don't see your scenario happening.